Switch control and indication system



June 20, 1939. H. s. YOUNG 2,152,927

SWITCH CONTROL AND INDICATION SYSTEM Filed NOV. 26, 1958 2 Sheets-Sheet1 I 20 L BM T7513 I cf 46' 16 20 1a aw 15- 11 19? A M 2? NM@ 2 jg 20 WV1 I REA 24 22 T323 1 27 DM 15 s 5131 0 ""p, .120 62 E 1 l 53 '50 w 19 20a @49 429 2 82 DM RD 64 l '64 Fig.1. B D

INVENTOR Henry S. Yazzg.

hiv M H16 ATTORNEY June 20, 1939. H. s. YOUNG SWITCH CONTROL ANDINDICATION SYSTEM Filed Nov. 26, 1938 2 Sheets-Sheet 2 EMA INVENTORS.Y0azzg.

Fig.4.

i ill 21B Patented June 20, 1939 UNITED STATES PATENT OFFICE- swrrcuCONTROL AND INDICATION SYS TEM

Application November 26, 1938, Serial No. 242,535

16 Claims.

My invention relates to a switch control and indication system, andparticularly to improved means for preventing improper operation of theswitch.

It has heretofore been proposed to provide switch control meansincorporating a lever movable between a normal and a reverse position toeffect control of the switch so that it will move to a positioncorresponding to that occupied by the lever. It has also been proposedto provide means such as a signal control lever associated with theswitch control lever for controlling signals which control movement oftrains through the track stretch in which the switch is mounted. It hasbeen proposed heretofore to have associated with the switch controllever mechanism known as the quick switch and operative on movement ofthe control lever from either of its positions towards the otherposition to prevent return of the control lever to its initial positionunless the switch completes its movement to the other position andeffects 'energization of an indication magnet for such other position ofthe switch.

It is an object of my invention to provide a switch control system inwhich a stick relay performs the functions heretofore performed by thequick switch mechanism.

A further object of my invention is to provide a system of the typedescribed in which neutral switch repeating relays are employed, thesystem being arranged to prevent undesired energization of either of theindication magnets in the event the energizing circuits for the switchrepeating relays become crossed.

Another object of my invention is to provide an improved switch controland indication system.

Other objects of my invention and features of novelty will be apparentfrom the following description taken in connection with the accompanyingdrawings.

I shall describe one form of apparatus embodylng my invention, togetherwith three modifications which I may employ, and shall then point outthe novel features thereof in claims.

Referring to the drawings, Fig. l is a diagram illustrating oneembodiment of the improved switch control and indication system providedFig. 3 is a fragmentary diagram illustrating anothermodification which Imay employ, and

'Fig. A is a fragmentary diagram illustrating a further modification ofthe system provided by my invention.

Referring to Fig. 1 of the drawings, the reference character Widentifies a railway track switch which is movable between a normal anda reverse position by suitable power driven means. This power drivenmeans is here shown diagrammatically as a fluid pressure motor which iscontrolled in the manner well-known in the art by a lock magnet valvedevice LMV, a normal magnet valve device NMV, and a reverse magnet valvedevice RMV.

The lock magnet valve device LMV, when energized, permits the supplyoffluid under pres sure to the motor, while the normal and reverse magnetvalve devices NMV and RMV control the supply of fluid under pressure tothe motor in such manner as to effect operation of the motor to causemovement of the switch W to the normal or reverse position.

The lock magnet valve device LMV, when deenergized, cuts off the supplyof fluid under pressure to the motor and thereby prevents operation ofthe motor to move the switch.

The supply of current for energizing the magnet valve devices LMV, NMVand RMV is controlled by a control lever L which may form a part of aninterlocking machine. The control lever L is controlled by a normalmagnet NM, a reverse magnet RM, and a lock magnet DM.

The supply of current for energizing the magnets NMand RM is controlledin a manner hereinafter explained in detail by a normal indication relayN'KR, a reverse indication relay RKR, a stick relay S, and by contactsassociated with the control lever L.

The lock magnet DM is energized by current supplied over a circuit whichis controlledby contacts 8 and 9 which are operated by a latch, notshown, associated with the lever L, while this circuit is alsocontrolled in the manner wellknown in the art by relays, not shown,responsive to trafiic conditions in the vicinity of the switch so thatthe circuit can be completed only when it is safe to effect a change inthe position occupied by the switch W.

- The circuits for energizing the normal and reverse indication relaysN'KR and RKR are controlled by a contact l0 which is movable inaccordance with movement of the switch W. I v The control lever L ismovable about an axis throughout a segment of a circle between normaland reverse points N and R, while intermediate points in the range ofmovement of the lever L are designated in the drawings by the letters X,B, D and Y. The positions B and D are the normal and reverse indicationpositions of the control lever L.

The lever L has associated therewith a plurality of contacts which arearranged so that the circuits controlled thereby are complete when andonly when the lever L is at or between predetermined points in its rangeof movement. The contacts are shown diagrammatically in the drawings andthe positions of the lever L in which the contacts are closed areindicated by the letters identifying the contacts.

The lever L has associated therewith two contacts BD which are closedwhen the lever L is in any position between the points B and D, or is ateither of these positions. The lever L also has associated therewith acontact D which is closed when and only when the lever L issubstantially at the position D, while there is a contact B which isclosed when and only when the lever L is substantially at the positionB.

In addition the lever L has associated therewith a contact NB which isclosed when the lever L is in any position between the points N and B,or is at either of these points, while there is a contact RD which isclosed when the lever L is in any position between the points R and D,or is at either of these points.

The lever L is mounted on a shaft, not shown, on which are also mountedthree segments, one for each of the magnets RM, NM and DM. Each of thesemagnets has an armature which controls a dog which cooperates with theassociated segment to limit or prevent movement of the lever L.

The segment associated with the magnet RM is arranged so that unless themagnet RM is energized the lever L cannot be moved towards the positionR, farther than the position D.

Similarly, the segment associated with the magnet NM is arranged so thatunless the magnet NM is energized the lever L cannot be moved towardsthe position N farther than the position 13.

The segment associated with the magnet RM is also arranged so that thelever L may be freely moved away from the position R even though themagnet RM is deenergized. Likewise, the segment associated with themagnet NM is arranged so that the lever L may be freely moved away fromthe position N even though the magnet NM is deenergized.

The segment associated with the magnet DM is arranged so that whenthemagnet DM is deenergized the lever L, if in the position N, can'- not bemoved farther from this position than the position X, while if the leverL is in the position R, and the magnet DM is deenergized, the

lever L cannot be moved farther away from the position R than theposition Y.

The details of the construction of the lever L and the associatedcontacts, segments and cooperating dogs are not a part of thisinvention, and these portions of this system are the same as thecorresponding portions of interlocking machines now in service.

The interlocking machine of which the switch control lever L forms apart includes a signal control lever, not shown, associated with theswitch control lever L and controlling the signals for governingmovement of trains through the track stretch in which the switch W islocated.

The signal control lever has an intermediate position in which all ofthe signals, not shown, associated with the switch W are at stop, whilethe lever is movable inone direction from this intermediate position toeffect or permit clearing of selected ones of the signals associatedwith the switch W, as for example the signals governing movement oftrains in one direction across the switch W.

Similarly the signal control lever is movable in the other directionfrom the intermediate position to effect or permit clearing of otherones of the signals associated with the switch W, as for example thesignals governing movement of trains in the other direction across theswitch W.

The switch control lever L and the signal control lever, not shown, aremechanically or otherwise interconnected in the manner well known in theart so that the signal control lever may be moved from the intermediateposition only when the switch control lever is in the normal position Nor the reverse position R, and so that the switch control lever L may bemoved only when the signal control lever is in the intermediateposition.

The switch operated contact In controls connection from terminal B of abattery l2 to the windings of the normal and reverse indication relaysNKR and RKR. One terminal of the winding of each of these relays hasconnected thereto a branch of wire 15 leading from terminal C of batteryl2. The other terminal of the winding of relay NKR is connected by wireIE to contact I8 which is engaged by switch operated contact l when andonly when the switch W is in the normal position. In this position ofthe switch W contact l0 also engages a contact 19 to which is connecteda branch of wire 20 leading from terminal B of battery [2. Accordinglyin the normal position of the switch W a circuit is established toenergize the winding of relay NKR, this circuit being traced fromterminal B of battery I2 through wire 20, contacts I9, 10 and I 8, wireI 6, winding of relay NKR, and wire l to terminal C of battery [2.

When the switch W is in the reverse position, the contact I0 engagescontacts 22 and 24. A branch of wire 20 is connected to contact 22,while contact 24 is connected by wire 25 to one terminal of the windingof relay RKR. When the switch W is in the reverse position, therefore, acircuit is establishedto energize the winding of relay RKR, this circuitbeing traced from terminal B of battery l2 through wire 20, contacts 22,I0 and 24, wire 25, winding of relay RKR and'wire [5 to terminal C ofbattery l2.

Although the switch operated contact ID has been described as being inengagement with the stationary contacts associated therewith when theswitch W is in the normal or the reverse position, it is contemplatedthat the apparatus may be arranged so that the contact l8 will engagethe associated stationary contacts only when the switch W has been movedto its normal or reverse position and the operating mechanism for theswitch has been conditioned to lock the switch in such position.

The normal indication relay NKR has a movable contact 21 which whenreleased engages a stationary contact 28 to which is connected a branchof wire 20 leading from terminal B of battery l2. The contact 21 isconnected by wire 29 to movable contact 30 of reverse indication relayRKR. Contact 30 when released engages a stationary contact 3| which isconnected by wire 32 to one terminal of the winding of stick relay S,the other terminal of which has connected thereto a branch of wire I5leading from terminal C of battery l2. Contact 30 of relay RKR whenpicked up engages a stationary. contact 34 to which is connected wire 35leading to a front contact 36 of stick relay S.

The normal indication relay NKR has, in addition, a movable contact 38which when picked up engages a stationary contact 39 which is connectedby a wire 40 to front contact 4| of stick relay S.

Contact 38 of relay NKR is connected by wire 42 to movable contact 44 ofrelay RKR, while contact 44 when released engages stationary contact 45to which is connected a branch of wire 20 leading from terminal B ofbattery l2.

The contact 38 of relay NKR when released engages a stationary contact41 to which is connected wire 48 leading to one terminal of the lockmagnet valve device LMV.

The stick relay S has a movable contact 50 which when picked up engagesa stationary contact 5| to which is connected a branch of wire 32leading to one terminal of the winding of the Wire IE to terminal 0 ofbattery I2.

The stick relay S has, in addition, a contact which when picked upengages contact 36. Contact 55 has connected'thereto a wire 51, whilelever operated contact D controls connection between wire 51 and oneterminal of the winding of reverse indication magnet RM, the otherterminal of which has connected thereto a branch of wire l5 leading fromterminal C of battery l2.

The stick relay S also has a movable contact 58 Which when picked upengages a stationary contact 4|, while contact 58 has connected theretoa wire 68. Lever operated contact B controls connection from wire 60 toone terminal of the normal indication magnet NM, the other termiofbattery l2, to wire 62 leading to one terminal valve device RMV.Similarly lever operated con- 'a branch of wire l5 leading from terminalC of of the winding of the normal magnet valve device NMV, while leveroperated contact RD controls connection between wire 2|! and wire 84leading to one terminal of the winding of'reverse magnet tact BDcontrols connection from wire 20 to wire 48 leading to the lock magnetvalve device LMV. The other terminal of the winding of each of themagnet valve devices is constantly connected to battery l2.

The equipment is shown in Fig. l of the drawings in the position whichit assumes when the switch W and the control lever L are in their"normal positions.

At this time contact l8 establishes the circuit for energizing thewinding of the normal indication relay NKR, while the circuit of thewinding of the reverse indication relay RKR is interrupted. As contact21 of relay NKR is picked up, the pick-up circuit for the stick relay Sis interrupted, and as contact 50 of relay S is released, the stickcircuit for the relay winding is interrupted. The stick circuit is alsointerrupted by contact BD associated with lever L since contact ED isopen when the lever L is in the normal position, thatis position N.

In addition at this time the circuit of the winding of the lock magnetvalve device LMV is interrupted since contact BD controlling the circuitto wire 48 is open, and since contact 38 of relay NKR is picked up. Asthe lock magnet valve device LMV is deenergized, the supply of fluidunder pressure to the switch motor is cut ofi and the switch, therefore,cannot be moved,

At this time, since the lever L is in the position N, contact NB isclosed and a circuit is established from wire 28 to wire 62 leading tothe normal magnet valve device NMV with the result that the winding. ofthis device is energized. However, since the lock magnet valve deviceLMV is deenergized at this time, energization of the normal magnet valvedevice NMV is without eifect, but is maintained to restore the switch tonormal in event of creepage as explained later.

It is assumed at this time that the latch operated contacts 8 and 9controlling the circuit of the winding of the lock magnet DM are openwith the result that the winding of magnet DM is deenergized.

In addition, at this time the windings of the magnets NM and RM areinterrupted by the lever operated contacts D and B, and also by thecontacts of the stick relayS.

If at this time the operator wishes to elfect movement of the switch Wfrom the normal to the reverse position, he may do so by moving thelever L from the normal position N to the reverse indicating positionindicated at D.

As explained above, the signal control lever, not shown, and the switchcontrol lever L are interconnected in such manner that the switchcontrol lever can be moved to efiect movement of the switch only whenthe signal control lever is in its intermediate position, at which timeall of the signals controlled thereby are conditioned.

to display the stop indication.

In order to effect movement of the lever, it is necessary first to closethe latch contacts 8 and 9, thereby energizing the lock magnet DM. Aspreviously explained, the circuit of the winding of the lock magnet DMis controlled not only by the latch contacts 8 and 9, but also byrelays, not shown, responsive to traiiic conditions in the vicinity ofthe switch W so that the circuit of the winding of the lock magnet DMcan only be completed if it is safe to effect movement of the switch W.Assuming that the circuit of the winding of the lock magnet DM iscompleted by closing of contacts 8 and 9, this winding becomes energizedand the dog controlled thereby is released to permit movement of thelever L past the position X and to the reverse indicating position D,While further movement of the lever L is prevented by the dogcontrolled-by the armature of the reverse indication magnet RM.

0n movement of the lever L out of the zone NB, the previously tracedcircuit-to the normal magnet valve device NMV is interrupted, while onmovement of the lever L to the zone intermediate the points B and D, thecontact BD completes the circuit for energizing the lock magnet valvedevice LMV. On movement of the lever L to the position D, at which pointfurther movement of the lever is restrained by the dog associated withthe reverse indication magnet RM, the contact RD completes the circuitfrom wire 20 to wire 64 leading to the winding of the reverse magnetvalve device RMV.

On energization of the reverse magnet valve' device RMV, fluid underpressure is supplied to the motor to cause the motor to move the switchW away from the normal position to the reverse position. On movement ofthe switch W away from the normal position, contact ID is moved out ofengagement with contacts I8 and I9, there by interrupting the circuitfor energizing the normal indication relay NKR with the result that thecontacts of this relay become released. On release of contact 38 ofrelay NKR, a circuit is established to maintain the lock magnet valvedevice LMV energized. This circuit is traced from terminal B of battery12 through wire 2!], contacts 45-44 of relay RKR, wire 42, contacts38-41 of relay NKR, Wire 43, Winding of lock magnet valve device LMV andwire I 5 leading to terminal C of battery l2. The lock magnet valvedevice LMV, therefore, will remain energized to permit the supply offluid under pressure to the motor as long as both of the indicationrelays are deenergized.

On release of contact 2'! of relay NKR, it engages contact 28 andcompletes the pick-up circuit for the stick relay S. This circuit istraced from terminal B of battery I! through wire 20, contacts 28-21 ofrelay NKR, wire 29, contacts 30'3| of relay RKR, wire 32, winding ofrelay S and wire IE to terminal C of battery l2.

On energization of the winding of relay S, its contacts become picked upand its contact establishes the stick circuit for the relay winding.This circuit includes wire 20 leading from terminal B of battery 12,contact BD of lever L;

wire 53, contacts 505I of relay S and wire 32 to one terminal of therelay winding. It will be seen, therefore, that on energization of thewinding of relay S, a stick circuit is established to maintain the relayWinding energized as long as the lever L remains in the zone BD andcontact BD remains closed. On movement of lever L outside of the zoneBD, contact BD becomes opened and the stick circuit for the relaywinding in interrupted.

On picking up of the contacts of the stick relay S, contact engagescontact 35 to establish a circuit for energizing the winding of thereverse indication magnet RM. This circuit, however, does not becomecompleteuntil contact 30 of relay RKR is picked up.

When the switch W reaches the reverse position, contact H] is moved intoengagement with contacts 22 and 24, thereby completing the energizingcircuit for the winding of relay RKR, and on energization of thiswinding, contact 30 of the relay is picked up and completes the circuitfor energizing the winding of reverse indication magnet RM. In addition,on energization of the winding of relay'RKR, contact 44 is picked up,thereby interrupting the circuit for establishing connection from wire28 to wire 48 leading to the lock magnet valve device LMV.

Furthermore, on picking up of contact 30 of relayRKR, the pick-upcircuit of the stick relay S is interrupted, but at this time thewinding of relay S remains energized by current supplied over the stickcircuit established by contact 50 of the relay.

When the contacts of relay S are picked up at a time when relay RKR isenergized, relay NKR is deenergized, and lever L is at position D, a.circuit is established for energizing the reverse indication magnet RM.This circuit is traced from terminal B of battery l2 through wire 20,contacts 2821 of relay NKR, wire 29, contacts 3034 of relay RKR, wire35, contacts 36--55 of relay S; wire 51, lever operated contact D,

Winding of reverse indication magnet RM, and wire l5 to terminal C ofbattery l2.

On energization of the winding of reverse indication magnet RM, the dogoperated by the armature of this magnet is released to permit movementof the lever L past the position D and all of the way to the position R.

On movement of the lever L away from the reverse indication position Dtowards the position R, contact D operated by the lever becomes opened,thereby interrupting the circuit of the winding of reverse indicationmagnet RM. However, before contact D is opened the lever L will havebeen moved far enough to prevent reengagement of the dog with theshoulder on the segment associated with the magnet RM, and hence lever Lmay be moved all of the way to the position R.

On movement of the lever L to the right from position D, contact BDbecomes opened, thereby interrupting the stick circuit for the windingof relay S with the result that the contacts of relay S become released.At this time the pickup circuit for the winding of relay' S isinterrupted since contact 30 of relay RKR is picked up, while on releaseof the contacts of relay S, contact 50 further interrupts the stickcircuit for the relay winding with the result that subsequent reclosingof' the contact BD will not effect picking up of the stick relaycontacts.

In addition, on movement of the lever L out of the zone between thepositions B and D, the contact BD controlling the circuit of the lockmagnet valve device LMV is opened, and the winding of the lock magnetvalve is deenergized with the result that the lock magnet valve cuts offthe supply of fluid under pressure to the motor for operating the switchW.

However, as the switch W has already been moved to the reverse position,fluid under pressure is no longer required by the motor for operatingthe switch, and deenergization of the lock magnet valve device servesto' prevent undesired movement of the switch.

After the lever L has been moved all of the way to the position R, theoperator releases the latch and contacts 8 and 9 interrupt the circuitof the lock-magnet DM and the dog associated with this magnet serves toprevent undesired movement of the lever L away from the position R.

It will be seen that when the lever L is in the position R, contact RDcontrolling the circuit of the winding of the reverse magnet valvedevice RMV is closed with the result that the winding of the valvedevice RMV remains energized;

However, as the lock magnet valve device LMV is normally deenergized atthis time, energization of the reverse magnet valve device is withouteffeet, but the energization is maintained for the purpose of restoringthe switch to the full reverse position in event of creepage asexplained later. a

When the lever L is in the'reverse position R the signal control lever,not shown, associated with the lever L maybe actuated to establishcircuits to permit clearing of the proper signals and thus permitsuchtrain movements across the switch W as may be carried out when theswitch W is inthe reverse position.

The system operates in a manner similar to that just described if withthe switch in the reverse position the operator desires to effect movement thereof to the normal position.

As previously explained, the signal control lever and the switch controllever L are interconnected in such manner that the switch control levercan be moved to effect movement of the switch only when the signalcontrol lever is in its intermediate position, at which time all of thesignals controlled thereby are conditioned to display the stopindication.

In order to eifect movement of the switch, the operator first closes thelatch contacts 8 and 9 to energize the lock magnet DM to permit movementof the lever L away from the position R. The lever L may then be movedfrom position R to the normal indication position B where furthermovement of the lever is prevented by the dog and segment associatedwith the normal indication magnet'NM.

On movement of the control lever L out of the zone RD, contact RDbecomes opened, thereby interrupting the circuit of the reverse magnetvalve device RMV. On movement of the control lever L to the zone BD,contact BD becomes closed and establishes the circuit for energizing thelock magnet valve device LMV, while on movement of the lever L to thenormal indication position B, contact NB is closed and establishes thecircuit for the normal magnet valve device NMV. When the lever L is inthe position B, therefore, magnet valve devices NMV and LMV are bothenergized and fluid under pressure is supplied to the motor for theswitch W to effect movement of the switch from the reverse to the normalposition.

On movement of the switch W away from the reverse position, contact l8moves out of engagement with contacts 22 and 24, thereby interruptingthe circuit of the winding of relay RKR with the result that itscontacts become released. At

this time contact 2'! of relay NKR is released so that on release ofcontact 30 of relay RKR, the pick-up circuit for the winding of relay Sis complete and the contacts of relay S become picked up. On picking upof contact 50 of relay S at a time when lever L is in the zone BD, thestick circuit for the winding of relay S is established so that thecontacts of relay S remain picked up after picking up of contact 21 ofrelay NKR.

When the switch W completes its movement to the normal position, contact10 engages contacts l8 and [9, thereby completing the circuit forenergizing the winding of relay NKR. The contacts of relayNKR,therefore, become picked up and contact 21 is opened to interrupt thepickup circuit for the stick relay S, while contact 38 of relay NKRbecomes picked up to establish the circuit for energizing the normalindication magnet NM. This circuit includes wire 20, contacts 4544 ofrelay RKR, wire 42, contacts 38-49 of relay NKR, wire 40, contacts dl-ESof relay 5, wire 60, lever operated contact B, winding of normalindication magnet NM, and wire I5 to terminal B of battery [2.

magnet NM.

When the lever L is moved to the left from the normal indicationposition B, the contacts BD are opened, thereby interrupting the stickcircuit of the stick relay S and also interrupting the energizingcircuit for the lock magnet valve device LMV. When the lever L is movedall of the Way to the position N, the operator releases the latch andpermits the latch operated contacts 8 and 9 to separate, therebydeenergizing the winding of the lock magnet DM.

As previously pointed out on movement of lever L to the normal positionN, the signal control lever, not shown, associated with the lever L maybe actuated to establish circuits to permit clearing of the propersignals and thus permit such train movements across the switch W as maybe carried out when the switch W is in the normal position.

The control system provided by my invention is arranged so that when theswitch W is in either position, if the switch should creep from thatposition, fluid under pressure will be supplied to the motor to returnthe switch to the position which it should occupy.

When theswitch W is in the normal position, the lever L is also in thenormal position and con tact ND completes the circuit to the normalmagnet valve device NMV. At this time, however, contact ED is open andthe circuit of the lock magnet valve device LMV is interrupted with theresult that no fluid under pressure is supplied to the motor.

When the switch W is in the normal position, contact 18 engages contactsl8 and it to maintain the normal indication relay NKR energized, whilerelay RKR is deenergized.

, If the switch W creeps from the normal posi tion, contact I0 is movedout of engagement with contacts I8 and I 9, thereby interrupting theenergizing circuit for the winding of normal indication relay NKR. Onrelease of contact 38 of relay NKR, a circuit is established to energizethe lock magnet valve device LMV. This circuit is traced from wire 20leading from terminal B of battery I2 through contacts 4544 of relayRKR,'wire 42, contacts 38-4! of relay NKR, wire 48 to one terminal ofthe winding of lock magnetvalve device LMV and wire I5 to terminal C ofbattery l2.

As magnet valve device LMV is now energized, fluid under pressure issupplied to the motor W to effect return of the switch W to thenormalposition. When the switch reaches the normal position, contact l0again engages contacts l8 and I9 and establishes the circuit for thewinding of relay NKR. On energization of the winding of relay NKR,contact 38 becomes picked up and interrupts the circuit for energizingthe winding of lock magnet valve device LMV with the result that thisvalve device operates to out 01f further supply of fluid under pressureto the motor for operating switch W.

The system operates in a similar manner if the switch W creeps from thereverse position,

When the switch W is in the reverse position,

control lever L is at position R and contact RD is closed with theresult that reverse magnet valve device RMV is -energized. At this time,however, lock magnet valve device LMV is deenergized, while relay RKR isenergized and relay NKR is deenergized.

When the switch W creeps from the reverse position, contact Ii no longerengages contacts 22 and 24, thereby interruptingthe circuit forenergizing the winding of relay RKR with the result that contact 44 ofthis relay becomes released and establishes the previously tracedcircuitfor energizing the lock magnet valve device LMV.

On energization of lock magnet valve device LMV at a time'when reversemagnet valve device RMV is energized, fluid under pressure is suppliedto the motor for the switch W to return the switch W to the reverseposition. When the switch W attains the reverse position, cont-act [0again engages contacts 22 and 24 and relay RKR becomes energized, whileits contact 44 is picked up and interrupts the circuit for energizinglock magnet valve device LMV.

The control system provided by this invention is arranged so that if thewires for energizing the normal and reverse indication relays NKR andRKR should become crossed so that both relays are energized at a timewhen only one should be, the normal and reverse indication magnets NMand RM cannot be energized, and

hence the control lever L cannot be moved all of the way from its normalor reverse position to the other.

This feature of the system prevents clearing of the signals controlledby the lever L, while inability of the operator to complete movement ofthe lever L to either its normal or reverse position will indicate tothe operator that the equipment is not functioning properly,

When the switch W is being moved from the reverse to the normalposition, the normal indiis in its normal position, while relay RKRshould cation magnet NM should become energized to permit movement ofthe control lever L to the left beyond the position B. The circuit forenergizing the normal indication magnet NM'is controlled by bothindication relays as well as by a contact of the stick relay S, and iscomplete only when the contact 38 of relay NKR is picked up and contact44 of relay RKR is released. Relay NKR. is normally energized when theswitch W be deenergized at this time. When the equipment is functioningin the intended manner, therefore, the circuit of the winding of normalindication magnet NM is complete when the lever L is at position B, andthe lever L may then be moved to the left from position B to position N.

If, however, on movement of the switch W to the normal position, thewires for energizing the relays NKR and RKRbecome crossed so that bothof these relays are energized, or if the winding of relay RKR isimproperly energized by current supplied from any other source, thecircuit for energizing the winding of normal magnet NM will beinterrupted since contact 44 of relay RKR is picked up.

Accordingly the winding of normal indication magnet NM cannot beenergized, and the dog associated with this magnet will prevent movementof the lever L beyond the position B towards the position N. As long asrelays NICR and RKR are both energized, therefore, the winding of normalindication magnet NM cannot be energized, and as long as normalindication magnet NM cannotbe energized, movement of the lever L to thenormal position N cannot be completed.

' Accordingly, the signal control lever, not shown,

associated with the lever L cannot be operated to effect clearing of thesignals controlled thereby, while inability of the operator to move thelever L to the normal position will indicate to him that the equipmentis not functioning properly. c

The equipment operates in a similar manner to prevent movement of thecontrol lever L to the reverse position if both the relays RKR and NKRare energized at a time when the switch W is in the reverse position. 7

Thus it will be seen that thecircuit for energizing the reverseindication magnet RM is controlled by a contact of the reverseindication relay RKR and also by a contact of the normal indicationrelay NKR.

When the equipment is functioning as intended on movement of the switchW to the reverse position, the relay RKR becomes energized and itscontact 30 will be picked up, while relay NKR is deenergized and itscontact 2'! is released. Under these conditions a circuit is establishedto permit energization of the winding of reverse indication magnet RMwhen the stick relay S is energized and the lever L is at position D.

On energization of reverse indication magnet RM, the dog controlledthereby is released and the lever L may be moved from position D toposition R.

If, however, on movement of the switch W to the reverse position relayNKR as well as relay RKR is energized due to a cross between the wiresleading to the windings of these relays, or if relay NKR is energizedfrom any other source, the circuit for the winding of reverse.

indication magnet RM cannot be completed and this magnet will remaindeenergized. This will be true since contact 21 of relay NKR will bepicked up, thus interrupting the circuit of the reverse indicationmagnet RM.

Accordingly since the Winding of reverse indication magnet RM cannot beenergized, this magnet will prevent movement of the control lever L tothe right beyond position D, and the operator will be unable to completemovement of the lever L to the position R.

The system provided by this invention is also arranged so that if forany reason, such as a crossed wire leading to the Winding of one of theindication relays, one or both of the indication relays NKR and RKRfailsto become deenergized during movement of the switch W from one ofits positions to the other, the normal and reverse indication magnets NMand RM cannot be energized, and hence movement of the lever L to eitherof its positions N or R cannot be completed.

When the switch W is moved away from either the normal or the reverseposition, contact In is moved out of engagement with the stationarycontacts associated therewith and the circuits for energizing bothindication relays are interrupted until the switch W completes itsmovement to the other of its positions. During movc ment of the switch Wbetween its two positions, therefore, both of the indication relays NKRand RKR should be deenergized.

When the indication relays NKR and RKR are both deenergized, the pick-upcircuit for the stick relay S is established, while on movement of thelever L to the region between positions B and D, contact ED is closed,thereby completing the stick circuit for the relay S with the resultthat when the contacts of relay S become picked up they remain pickedup.

On picking up of the contacts of relay S, contact 55 is closed to permitthe circuit of the winding of reverse indication magnet RM to becompleted, while contact 58 is closed to permit the circuit of thewinding of normal indication magnet NM to be completed.

If the equipment does not function in the intended manner, however, andif both of the indication relays NKR and RKR do not become deenergizedduring movement of the switch W between its two positions, the stickrelay S will not become energized and its contacts will not becomeclosed. 75-

Thus it will be seen that if either'relay NKR or relay RKR remainsenergized, the pick-up circuit for relay S is not established and thecontact 59 of this relay remains released with the result that the stickcircuit for the relay winding cannot be established even though contactED is closed.

Accordingly, ,under such circumstances, the contacts and 58 of the relayS remain open and the windings of the reverse indication magnet RM andof the normal indication magnet NM cannot be energized, and hence thesemagnets operate to restrict movement of the lever L and prevent it beingmoved either to the position N or to the position R. As previouslystated, this inability of the operator to complete movement of theswitch control lever. L indicates to him that the system is notfunctioning in the intended manner, while since the lever L cannot bemoved to its normal or reverse position the signal control lever cannotbe moved out of its intermediate position. i

From the foregoing, it will be seen that the stick relay S performs thefunction of the quick switch, that is, on movement of the lever L fromeither the normal or the reverse position, the relay S requiresoperation of the switch in response to this lever movement beforemovement of the lever to the other position can be completed, or beforethe lever can be returned to its initial position. Thus it will beseenthat the stick relay S is normally deenergized and becomes energizedonly when the contacts of both indication relays are released. Thecontacts of both indication relays are released only when the switch Wis in transit between its two positions, and, accordingly, in order. forthe relay. S to become energized the switch W must move away from eitherthe normal or the reverse position to an intermediate position.

If for any reason on movement of the lever L away from. eitherof itspositions to effect movement of the switch W to theother of itspositions the switch fails to move, the relays NKR and RKR will not bothbe deenergized and the relay S will not become energized. As relay Sdoes not become energized under these circumstances, its

contacts 55 and 58 remain released and interrupt the lcircuits of thewindings of the normal and reverse indication magnets NM and RM so thatneither of these magnets can be energized.

Unless one of these magnets is energized, the lever L cannot be movedout of the zone between the points B and D. Hence on movement of thelever L to this zone, the lever cannot thereafter .be returned to theposition from which it was 'moved, nor can it complete its movement tothe other position unless the switch W moves in response to movement ofthe lever L and effects deenergization of both of the indication relays.

Since operation of the switch W must follow movement of the lever L toprevent locking of lever L in an intermediate zone, and since theindication-magnets can only be energized in the event such movement ofthe switch does occur, the system insures that. when an indication isreceived, that is, when one of the indication magnets is energized andpermits movement of the control lever out of the intermediate zone toeither its normal or reverse position, that there is correspondencebetween the position occupied by the switch and the position of thecontrol lever.

In Fig. 2 of the drawings, I have shown a modification of the systemshown in Fig. 1 which I may employ and which provides further protectionagainst improper operation ofthe system bypreventing energization of thelock magnet DM, and, therefore, preventing movement of the control leverL away from either its normal or reverse position unless the positionsof the control lever and of the switch are in agreement.

The system shown in Fig. 2 of the drawings is the same as that shown inFig. l of the drawings except as hereinafter explained in detail.

Referring to Fig. 2 of the drawings, it will be seen that the circuit ofthe winding of the lock magnet DM is controlled not only by the latchcontacts 8 and 9 but also by the contacts NX and RY associated with thelever L, and by contacts of the indication relays NKR and RKR.

One terminal of the winding of the lock magnet DM is connected to wire21 by a circuit controlled by latch contacts 8 and 9, while the otherterminal of the winding ofthe lock magnet DM is connected by a wire 10to lever controlled contacts NX and RY.

The contact NX is controlled by the lever L in such a manner that thecontact is closed when and only when the lever L is in a zoneintermediate the positions N and X or is at either of these positions,while contact RY is controlled by the lever L in such a manner that itis closed when and only when the lever L is in a zone intermediate thepositions R and Y or is at either of these positions.

The contact NX is connected by a wire ll with a front contact 72 ofrelay NKR, while contact RY is connected by a wire 14 with front contact'15 of relay RKR. Relay RKR has a movable contact 16 which is connectedby a wire 1! to movable contact 19 of relay NKR.

Contact'lfi of relay RKR is adapted when released to engage a stationarycontact 80 to which is connected a branch of wire 8|, while contact 19of relay NKR is adapted when released to en-' gage a stationary contact83 to which is connected another branch of wire 8|.

Wire 8| is connected to one terminal of a suitable source of current,such asthe battery l2 in Thei circuit of the wire 8! may be controlledby means the system shown in Fig.1 of the drawings.

well known in the art, such as lock relays, not

shown, responsive to trafiic conditions in the vi-- is picked up andengages stationary contact 12, while when relay RKR is deenergized, itscontact F6 is released and engages stationary contact 80 to which isconnected wire 8| leading from one terminal of the source of current. Acircuit,

therefore, is established between wire BI and wire 1 ll], this circuitincluding contacts 80-46 of relay RKR, wire 11, contacts 19'I2'of relayNKR, wire H, lever controlled contact NX and wire 10 lead- I ing to thewinding of the lock magnet DM.

When the switch W is in the normal position BOZ ing the latch contacts 8and 9, providing that the contacts of the lock relays, not shown, in thecircuit of the wire 8| are closed. On energization of the lock magnetDM, the dog controlled by the armature of this magnet is released topermit movement of the lever L away from the position N, and when thelever L is moved beyond the position X, the contact NX is opened,thereby interrupting the circuit for energizing the winding of the lockmagnet. However, before the winding becomes deenergized lever L willhave been moved far enough so that the segment. and dog associated withthe lock magnet DM will not interfere with further movement of the leverL.

In like manner, when the switch W is in the reverse position, thecontacts of the normal and reverse indication relays establish a circuitto permit energization of the winding of the lock magnet DM providingthe control lever L is in the reverse position.

When the switch W is in the reverse position, relay RKR is normallyenergized and relay NKR is deenergized. Accordingly contact 19 of relayNKR is released and engages contact 83, while contact 16 of relay RKR ispicked up and engages contact 15. If at this time the control lever L isin the reverse position, contact RY is closed and a circuit isestablished from wire 8| to wire 10, this circuit being traced from wire8| through contacts 83-19 of relay NKR, wire Tl, contacts 16-15 of relayRKR, wire 14, contact RY and wire 10.

v If at this time it is desired to effect movement of the control leverL away from position R the latch contacts 8 and 9 are closed, and if thecontacts of the locking relays, not shown, are closed, the winding oflock magnet DM will be energized and the control lever L may be movedaway from the position R. On movement of the control lever L beyond theposition Y, contact RY becomes open, but before this occurs the leverwill have been moved far enough so that the dog and segment associatedwith the lock magnet DM will not interfere with further movement i; ofthe lever.

From the foregoing it is clear that the modification shown in Fig. 2 ofthe drawings operates in such manner that if the normal and reverseindication relays NKR and RKR are energized in the proper manner, thelock magnet DM may be energized to permit movement of the control leveraway from either its normal or reverse position.

This system also operates so that if for any L reason the indicationrelays NKR and RKR are not properly energized, the lock magnet DM cannotbe energized, and hence the control lever L cannot be moved away fromeither its normal or reverse position.

Thus it will be seen that the circuit of the Winding of the lock magnetDM is controlled by contacts of both of the indication relays, and alsoby contacts controlled by the lever, and the circuits are arranged sothat the circuit of the lock magnet winding is complete when and onlywhen there is correspondence between the position of the control leverand the switch, and when the indication relays are properly energized.

If for any reason both of the indication relays NKR and RKR should bedeenergized or both should be energized, no connection would beestablished between wire 8! and wire 1!]. Hence the winding of lockmagnet DM could not be energized and the lock magnet would not permitmovement of the control lever L away from either the normal or thereverse position.

Similarly, if one of the indication relays is energized'and the other isdeenergized, a circuit will be established from the wire 8| to one ofthe wires II or 14. However, if at this time the positions of thecontrol lever and the switch are not in correspondence so that thecontact NX is closed at a time when relay NKR is released and relay RKRis picked up, or if contact RY is closed at a time when relay RKR isdeenergized and relay NKR is energized, no circuit can be established toenergize the winding of the lock magnet DM.

From the foregoing it is clear that unless the equipment is operating inthe intended manner, the winding of the lock magnet DM cannot beenergized and movement of the control lever will be prevented.

In Fig. 3 of the drawings there is shown a modification in which theindication magnets NM and RMA perform the functions performed by thelock magnet DM in the systems shown in Figs. 1 and 2 of the drawings.

With the modification shown in Fig. 3 of the drawings somewhatdifferently shaped segments are employed with the indication magnetsthan are employed in the system shown in Fig, 1. In the system shown inFig. 3 the segment associated with the normal indication magnet NMA isarranged so that movement of the lever L to the position N and also awayfrom this position is prevented unless the magnet winding is energized.

Similarly in the system shown in Fig. 3 the segment associated withreverse indication magnet RMA is arranged so that movement of the leverL to the reverse position R and also away from that position isprevented unless the winding of the magnet is energized.

The system shown in Fig. 3, is the same as that shown in Fig. 1 exceptas hereinafter explained in detail.

In the system shown in Fig. 3 of the drawings, as in the system shown inFig. 1, circuits controlled by the stick relay S and by contacts B and Dassociated with the control lever L are provided for energizing thenormal and reverse indication magnets to permit movement of the lever tothe normal or to the reverse position.

The system shown in Fig. 3 of the drawings includes, in addition,circuits controlled by the normal and reverse indication relays, thelatch controlled contacts and the lever controlled contacts as well asby contacts of the locking relays, not shown, for energizing theindication magnets to permit movement of the lever L away from eitherthe normal or the reverse positions.

The circuits including the wires 51a. andGOa for energizing the reversemagnet RMA and normal magnet NMA, are the same as described in detail inconnection with the system shown in Fig. 1 of the drawings, and thedescription of the operation of this portion of the system shown in Fig.3 need not be repeated.

The circuits shown in Fig. 3 of the drawings are similar to those shownin Fig. 2 and operate so that neither of the indication magnets can beenergized unless the positions of the control lever L and the switch Ware in correspondence, and unless the indication relays are functioningin the intended manner.

When the switch W is in the normal position, relay NKR should beenergized and relay RKR should be deenergized. Under thesecircumstances, assuming that the contacts of the route or lockingrelays, not shown, controlling the circuit of wire Blw are closed, andthat the lever L is in the normal position N so that contact NX isclosed, a circuit for energizing the normal indication magnet NMA isestablished by closing the latch contacts 8a and 9a. This circuit istraced from wire Bla, leading from one terminal of a source of current,through contacts 80a16a of relay RKR, Wire 1101., contacts 19a12a ofrelay NKR, wire I la, latch contacts 9a8a, lever controlled contact NX,winding of normal indication magnet NMA and wire IE to the otherterminal of the source of current.

On energization of the winding NMA, the armature of this magnet isoperated to release the dog controlled thereby so that the lever L maybe moved away from the normal position.

When the lever L is moved beyond the position X, the contact NX becomesopen, thereby interrupting the circuit of the winding of the magnet NMA,but before this winding is deenergized the lever will have been movedfar enough so that the dog and segment associated with the magnet NMAwill not prevent further movement of the lever L towards the reverseposition.

On movement of the lever L to the position D, a circuit is establishedto energizethe winding of the reverse magnet RMA, this circuit beingcontrolled by a contact of the stick relay S and being complete only ifthe contacts of the stick relay are picked up.

If on movement of the control lever L to the position D the winding ofreverse indication magnet RMA becomes energized, the lever may be movedall of the way to the reverse position.

When the lever L is moved beyond the position D, contact BD interruptsthe stick circuit of the stick relay S (see Fig. 1) with the result thatthe.

contacts of this relay become released and interrupt the energizingcircuit of the reverse indication magnet RMA.

However, before the contact ED is opened to effect deenergization of thereverse indication magnet RMA the lever L will have been moved farenough towards the position R so that further movement of the lever inthis direction is not prevented by the reverse indication magnet and itsassociated segment and dog.

The system operates in a similar manner when the lever L is being movedfrom the reverse posiition R to the normal position N.

In order to effect movement of the lever'L away from the reverseposition R it is necessary first to effect energization of the reverseindication magnet RMA. This can be accomplished if the reverseindication relay RKR is energized and the normal indication relay NKR isdeenergized as they should be when the switch W is in the reverseposition. Under these circumstances, providing the contacts of thelocking relays, not shown, are closed, on closing of the latch contacts8b and 9ba circuit is established for energizing the winding of thereverse indication magnet RMA, this circuit being traced from wire 8| (1through contacts 83a 19a of relay NKR, wire 1.1a, contacts 15a15a ofrelay RKR, wire 14a, contacts lib-8b, lever controlled contact RY, andwinding of reverse indication magnet RMA to wire l5.

On energization of the winding of the magnet RMA, the lever L may bemoved away from the position R into the zone DB, and on movement of thelever to this Zone, contact RY becomes opened,

thereby interrupting the circuit of the winding of the magnet RMA.However, before this occurs the lever will have been moved far enough sothat further movement of the lever is not restricted by the magnet RMA.

On movement of the lever L to the position B,

contact NB is closed (see Fig. 1), and the normal magnet valve deviceNMV is energized to effect the supply of fluid under pressure to themotor for operating the switch W to eifect movement of the switch to thenormal position.

On movement of the switch W toan intermediate position, the pick-upcircuit for the stick relay S (see Fig. 1) is established, and onpicking up of the contacts of relay S while the lever L is at position Bthe stick circuit for the winding of relay S is established. Inaddition, on picking up of the contacts of relay S at a time when thelever L is at position B, the circuit for energizing the winding of thenormal indication magnet NMA is complete and on energization of thewinding of this magnet, its armature moves the dog associated therewithso that the lever L may be moved all of the way to the normal positionN.

On movement of the lever L to the position N, contact ED is opened (seeFig. 1), thereby interrupting the stick circuit for the winding of relayS and effecting deenergization of the winding of normal indicationmagnet NMA.

In the system shown in Fig. 3 the circuit for energizing either of theindication magnets can only be established if there is agreement betweenthe position of the switch W and the position of the lever L, and if theindication relays are functioning properly.

Thus, when the lever L is in the normal position, at which time contactNX is closed and contact RY is open, a circuit forenergizing the normalindication magnet NMA can be established if and only if the normalindication relay NKR is energized and the reverse indication relay RKRis deenergized.

If for any reason both indication relays NKR and RKR are energized orboth are deenergized, or if when the lever L is in the normal positionrelay RKR is energized and relay NKR is deenergized, the circuit of thewinding of the normal indication magnet NMA cannot be completed, and.this magnet will prevent movement of the lever L away from the normalposition.

Similarly, if when the lever L is in the reverse position, at which timecontact RY is closed and contact NX is open, a circuit for energizingthe reverse indication magnet RMA can be established if and only if thereverse indication relay RKR is energized and the normal indicationrelay NKR is deenergized.

If for any reason both indication relays NKR and RKR are energized orboth are deenergized, or if when the lever is in the reverse positionrelay NKR is energized and relay RKR is deenergized, the circuit of thewinding of the reverse indication magnet RMA cannot be completed andthis magnet will prevent movement of lever L away from thereverse'position.

From the foregoing it is clear, therefore, that the modification shownin Fig. 3 of the drawings is arranged so that preliminary agreement isrequired between the position of the switch 'W and the control lever Lor movement of the lever L away from either its normal or reverseposition is prevented. 7

Furthermore, the modification shown in Fig. 3

of the drawings requires proper operation of the indication relays NKRand RKR before the lever L may be moved from either the normal or thereverse position.

In Fig. 4 of the drawings there is shown a modification similar to thatshown in Fig. 3 in that the normal and reverse indication magnets NMBand RMB perform the functions performed by the lock magnet DM in thesystem shown in Fig. 1 of the drawings. The system shown in Fig. 4 ofthe drawings employs segments associated with the indication magnets RMBand NMB of the same type employed in the system shown in Fig. 3 of thedrawings.

The modification shown in Fig. 4 differs from that shown in Fig. '3,however, in that the system shown in'Fig, '4does not incorporate thepreliminary agreement feature of the system shown in Fig. 3, thatis,-themodification shown in Fig. 4 does not require agreement betweenthe position of the lever L and of the switch W to permit energizationof the indication magnets and thus permit movement of the lever L awayfrom either the normal or the reverse position.

The system shown in Fig. 4 of the drawings is the same as that shown inFig. 1 of the drawings except as hereinafter explained in detail.

The system shown in Fig. 4 of the drawings includes circuits controlledby contacts B and D associated with the lever L for energizing thenormal and reverse indication magnets NMB and RMB. These circuits aresimilar to the corresponding circuits of the system shown inFig. 1of'the drawings and may be established'when the contacts of the stickrelay S are picked up. These circuits provide means to energizethe-indication magnets to permit movement of the lever L from anintermediate position to the'normal or reverse position.

The system shown in Fig. 4 of the drawings includes, in addition,circuits controlled by con-' tacts associated with the lever'L and bythe latch contacts as well as by contacts of the looking or routerelays, not shown, for energizing the indication magnets. These circuitsprovide means for energizing the indication magnets to permit movementof the lever L away from either-the normalor the reverse position.

Referring to thedrawings, it will be seen that the modification showninFig. 4 has a wire- 83b leading from one terminal of a source of current.The circuit of this wire is controlled by contacts of route or lookingrelays, not shown, so that the circuit of the wire can be completed onlywhen it is safe to efiect movement of the switch W between itspositions. The circuit is also controlled by the latch contacts 8c and'9c, while connection from wire Blb to one terminal of the winding of thenormal indication magnet NMB is controlled by a contact NX associatedwith the lever L. In addition, connection from latch contact 80 to oneterminal of the winding of the reverse indication magnet RlVlIB iscontrolled by contact RY associated with the lever L.

When the leverL is in the normal position, contact NX is closed, and ifthe latch contacts 80 and 9c are now closed, a circuit will beestablished to energize the normal indication magnet NMB, providing thecontacts of the route and locking relays, not shown, are picked up. Onthis energizationof the normal indication magnet NMB, the magnetoperates to permit movement of the lever L away from the normalposition.

When the lever L has been moved away from the normal position beyondpoint X, contact NX becomes open, but by this time the lever will havebeen moved'far enough so that its further movement will not beinterfered with by the normal indication magnet NMB.

When the lever L'is in the reverse position, contact RY is'closed sothat on closing of the latch contacts 80 and 90, a circuit isestablished to energize the winding of reverse indication magnet RMB,provided the contacts of the looking or route-relays, not shown,controlling the wire 8| b are picked up.

On energization of the reverse indication magnet RMB, the lever L'may bemoved away from the reverse position R, whileon movement of the leverbeyond the-position Y, contact RY becomes open to interrupt the circuitof the winding of the reverse indication magnet. However, before thiscircuit is interrupted-the leverwill have been moved far enough so thatfurther movement of .the lever will not beinterfered with by the reverseindication magnet.

It will be seen that in the system shown in Fig, 4 of the drawings ifthecontacts of the locking or route relays associated with wire 8lb areopen, neitherof the indication magnets can be energized and hence thelever L cannot be moved away from either its normal or reverse position.

In this system, therefore, the indication magnets performthefunctionperformed by the lock .magnet DM employed in the system shown in Fig.1.of the'drawings.

Although I have herein shown and described one embodiment of theimproved'switch control and indication system provided by my invention,together with three modifications thereof which I-may employ, it shouldbe understood that the invention isnot limited to these details ofconstructiom-and that numerous'changes and modifications maybe. madetherein within the scope of the-appended claims-without departing fromthe spirit and scopeof my invention.

Having thus described myinvention, what I claim is:

1. In combination, a railway track switch, a motor "for moving saidswitch between a normal and a reverse position, a normal and a'reverseindication relay, a lever-movable between a normaland .areverseposition, said lever also having a'normal indication position in whichit 'efiects operation of the motor to move the switch to the normalposition and having a reverse'indication position in which iteffects'operation of 'the'mo tor to move the switch'to the reverseposition, a member I movable in "accordance with movement of the-switch,said member being operable when and only when the switch is'inthe'normal position to establish a circuit for energizing the normalindication relay and being operable when and only when the switch is inthe reverse position-to establish a circuit for energizing thereverse'indication relay, a stick relay, a pick-up circuit for saidstick relay which is complete when and only'when' both of the indicationrelays are deenergized, a stick circuit for said stick relay, said stickcircuit'being established on picking up of the contacts of the stickrelay, a normal indicationmagnet operable when 'deenergized'to preventmovement of the lever to the normal position, said magnet being operablewhen energized to permit such lever movement, and circuitscontrolledbythe lever, .by contacts of the stick relay, and by contacts of theindication relays for energizing said indication magnets.

2. In combination, a railway track switch, a motor for moving saidswitch between a normal and a reverse position, a normal and a reverseindication relay, a lever movable between a normal and a reverseposition, said lever also having a normal indication position in whichit effects operation of the motor to move the switch to the normalposition and having a reverse indication position in which it effectsoperation of the motor to move the switch to the reverse position, amember'movable in accordance with movement of the switch, said memberbeing operable when and only when the switch is in the normal positionto establish a circuit for energizing the nor mal indication relay and.being operable when and only when the switch is in the reverse positionto establish a circuit for energizing the reverse indication relay, astick relay, a pick-up circuit for said stick relay which is completewhen and only when both of the indication relays are deenergized, astick circuit for said stick relay, said stick circuit being establishedon picking up of the contacts of the stick relay, said 1ever beingoperable on movement to either its normal or reverse position tointerrupt said stick circuit, a normal indication magnet operable whendeenergized to prevent movementof, the lever to the normal position,said magnet being operable when energized to permit such lever movement,a reverse indication magnet operable when deenergized to preventmovement of the lever to the reverse position, said magnet beingoperable when energized to permit such lever movement, and circuitscontrolled by the lever, by contactsof the stick relay, and by contactsof the indication relays for energizing said indication magnets.

3. In combination, a railway track switch, a motor for moving saidswitch between a normal and a reverse position, a normal and a reverseindication relay, a lever movable between anormal and a reverseposition, said lever also having a normal indication position in whichit eiTects operation of the motor to move the switch to the normalposition and having a reverse indication position in which it effectsoperation of the motor to move the switch to the reverse position, amember movable in accordance with movement of the switch, said memberbeing operable when and only when the switch is in the normal positionto establish a circuit for energizing the normal indication relay andbeing operable when and only when the switch is in the reverse positionto establish a circuit for energizing the reverse indication relay, astickrelay, a pick-up circuit for said stick relay which is completewhen and only when both of the indication re lays are deenergized, astick circuit for said stick relay, said stick circuit being establishedon picking up of the contacts of the stick relays, a normal indicationmagnet operable when deener gized to prevent movement of the lever tothe normal position, said magnet being operable when energized to permitsuch lever movement, a reverse indication magnet operable whendeenergized to prevent movement of the lever to the reverse position,said magnet being operable when energized to permit such lever movement,a circuit controlled by said lever for energizing the normal indicationmagnet, said circuit being complete only when the normal indicationrelay and the stick relay are energized and the reverse indication relayis deenergized, and a circuit controlled by said lever for energizingthe reverse indication magnet, said circuit being complete only when thereverse indication relay and the stick relay are energized and thenormal indication relay is deenergized.

4. In combination, a railway track switch, a motor for moving saidswitch between a normal and a reverse position, a normal and a reverseindication relay, a lever movable between a normal and a reverseposition, said lever also having a normal indication position in whichit effects operation of. the motor to move the switch to the normalposition and having a reverse indication position in which it effectsoperation of the motor to move the switch to the reverse position, amember movable in accordance with movement of the switch, said memberbeing operable when and only when the switch is in the normal positionto establish a circuit for energizing the normal indication relay andbeing operable when and only when the switch is in the reverse positionto establish a circuit for energizing the reverse indication relay, astick relay, a pick-up circuit for said stick relay which is completewhen and only when both of the indication relays are deenergized, astick circuit for said stick relay, said stick circuit being establishedon picking up of the contacts of the stick relay; said lever beingoperable on movement to either its normal or its reverse position tointerrupt said stick circuit, a normal indication magnet operable whendeenergized to prevent movement of the lever to the normal position,said magnet be ing operable when energized to permit such levermovement, a reverse indication magnet operable when deenergized toprevent movement of the lever to the reverse position, said magnet beingoperable when energized to permit such lever movement, a circuitcontrolled by said lever for energizing the normal indication magnet,said circuit being complete only when the normal indication relay andthe stick relay are energized and the reverse indication relay isdeenergized, and a circuit controlled by said lever for energizing thereverse indication magnet, said circuit being complete only when thereverse indication relay and the stick relay are energized and thenormal indication relay is deenergized.

5. In combination, a railway track switch, a motor for moving saidswitch between a normal and a reverse position, a normal and a reverseindication relay, a control lever movable between a normal and a reverseposition, said lever also having a normal indication position in whichit effects operation of the motor to move the switch to the normalposition and having a reverse'indication position in which it effectsoperation of the motor to move the switch to the reverse position, amember movable in accordance with move-- ment of the switch, said memberbeing operable when and only when the switch is in the normal positionto establish a circuit to energize the norand only when the switch is inthe reverse position to establish a circuit to energize the reverseindication relay, a stick relay, means operable only during movement ofthe switch between its two positions'for establishing a pick-up circuitfor said stick relay, said stick relay being operable when energized toestablish a stick circuit for energizing its own winding, a normalindication magnet operable when deenergized to prevent movement of thelever to the normal position, said magnet being operable when energizedto permit such lever movement, a reverse indication magmal indicationrelay and being operable when net operable when deenergized to preventmovement of the lever to the reverse position, said magnet beingoperable when energized to permit such lever movement, and circuitscontrolled by contacts of the stick relay, by contacts of the indicationrelays, and by contacts associated with the lever for energizing saidindication magnets.

6. In combination, a railway track switch, a motor for moving saidswitch between a normal and a reverse position, a normal and a reverseindication relay, a control lever movable between a normal and a reverseposition, said lever also having a normal indication position in whichit effects operation of the motor to move the switch to the normalposition and having a reverse indication position in which it effectsoperation of the motor to move the switch to the reverse position, amember movable in accordance with movement of the switch, said memberbeing operable when and only when the switch is in the normal positionto establish a circuit to energize the normal indication relay and beingoperable when and only when the switch is in the reverse position toestablish a circuit to energize the reverse indication relay, a stickrelay, means operable onlyduring movement of the switch between its twpposi tions for establishing a pick-up circuit for said stick relay, saidstick relay being operable when energized to establish a stick circuitfor energizing its own winding, said lever being operable on movement toeither its normal or reverse position to interrupt said stick circuit, anormal indication magnet operable when deenergized to prevent movementof the lever to the normal position, said magnet being operable whenenergized to permit such lever movement, a reverse indication magnetoperable when deenergized to prevent movement of the lever to thereverse position, said magnet being operable when energized to permitsuch lever movement, and circuits controlled by contacts of the stickrelay, by contacts of the indication relays, and by contacts associatedwith the lever for energizing said indication magnets.

7. In combination, a railway track switch, a motor for moving saidswitch between a normal and a reverse position, a normal and a reverseindication relay, a lever movable between a normal and a reverseposition, said lever also having a normal indication position in whichit efiects operation of the motor to move the switch to the normalposition and having a reverse indication position in which it efiectsoperation of the motor to move the switch to the reverse-position, amember movable in accordance with movement of the switch. said memberbeing operable when and only when the switch is in the normal positionto establish a circuitfor energizing the normal indication relay andbeing operable when and only when the switch is in the reverse positionto establish a circuit for energizing the reverse indication relay, astick relay, a pick-up circuit for said stick relay which is completewhen and only when both of the indication relays are deenergized, astick circuit for said stick relay, said stick circuit being establishedon picking up of the contacts of the stick relay, a normal indicationmagnet operable when deenergized to prevent movement of the lever to thenormal position, said magnet being operable when energized to permitsuch lever movement, a reverse indication magnet operable whendeenergized to prevent movement of the lever to the reverse position,said magnet being operable when energized to permit such lever movement,circuits controlled by the lever, by contacts of the stick relay, and

by contacts of the indication relays for energizing said indicationmagnets, a lock magnet operable when deenergized to prevent movement ofthe lever away from either its normal or reverse position to either ofits indication positions, said lock magnet being operable when energizedto permit such lever movement, and a circuit controlled by the lever andalso by the indication relays for energizing said lock magnet.

8. In combination, a railway track switch, a motor for moving saidswitch between a normal and a reverse position, a normal and a reverseindication relay, a lever movable between a normal and a reverseposition, said lever also having a normal indication position in whichit effects operation of the motor to move the switch to the normalposition and having a reverse indication position in which it effectsoperation of the motor to move the switch to the reverse position, amember movable in accordance with movement of the switch, said memberbeing operable when and only when the switch is in the normal positionto establish a circuit for energizing the normal indication relay andbeing operable when and only when the switch is in the reverse positionto establish a circuit for energizing the reverse indication relay, astick relay, a pick-up circuit for said stick relay which is completewhen and only when both of the indication relays are deenergized, astick circuit for said stick relay, said stick circuit being establishedon picking up of the contacts of the stick relay, a normal indicationmagnet operable when deenergized to prevent movement of the lever to thenormal position, said magnet being operable when energized to permitsuch lever movement, a reverse indication magnet operable whendeenergized to prevent movement of the lever to the reverse position,said magnet being operable when energized to permit such lever movement,circuits controlled by the lever, by contacts of the stick relay, and bycontacts of the indication relays for energizing said indicationmagnets, a lock magnet operable when deenergized to prevent movement ofthe lever away from either its normal or reverse position to either ofits indication positions, said magnet being operable when energized topermit such lever movement, a circuit for energizing said magnet whenthe lever is in the normal position, said circuit being complete onlywhen the normal indication relay is energized and the reverse indicationrelay is deenergized, and a circuit for energizing said magnet when thelever is in the reverse position, said circuit being complete only whenthe reverse indication relay is energized and the normal indicationrelay is deenergized.

9. In combination, a railway track switch, a motor for moving saidswitch between a normal and a reverse position, a normal and a reverseindication relay, a lever movable between a normal and a reverseposition, said lever also having a normal indication position in whichit effects operation of the motor to move the switch to the normalposition and having a reverse indication position in which it effectsoperation of the motor to move the switch to the reverse position, amember movable in accordance with movement of the switch, said memberbeing operable when and only when the switch is in the normal positionto establish a circuit for energizing the normal indication relay andbeing operable when and only when the switch is in the reverse positionto establish a circuit for energizing the reverse indication relay, astick relay, a pick-up circuit for Saidstick'relay which is completewhenand only when both of the indication relays are deener: gized, astickqcircuit for said stick relay, said stick circuit being establishedon picking up of the contacts of the stick relay, a normal indicationmagnetoperable when denergized to prevent movement of the lever to orfrom the normal position, said magnet being operable when energized topermit such lever movement, a reverse indication magnet operable whendeenergized to prevent movement of the lever to or from the reverseposition, said magnet being operable when energized to permit such levermovement, a circuit for energizing the normal indication magnet, saidcircuit: beingcomplete when and only when the lever is in the normalindication position, the stick relay and'the normal indication relay areenergized and the reverse indication relay is deenergized, anothercircuit for energizing the normal indication magnet, said other circuitbeing complete. only when the lever is in the normal position, thenormal indication relay is energized andthe reverse indication relay isdeenergized, a circuit for energizing the reverse indicationmagnet'jsaid circuit being completewhen and only when the lever is inthe reverse indication position, the stick relay and thereverseindication relay are energized, and the normal indication relay isdeenergized, and another circuit for energizing thereverse indicationmagnet, said circuit being complete only when the lever is in the reverse position, the reverse indication relay is energized and the normalindication relay is deenergized.

10. In combination, a railway track switch, a motor for moving saidswitch between a normal and a reverse position, a normal and a reverseindication relay, a lever movable between a normal and a-reverseposition, said lever also having a normal indication position in whichit effects operation of the motor to move the switch to the normalposition and having a reverse indication position in which it effectsoperation of the motor to move the switch to the reverse position; amember movable in accordance with'movement of the switch, said memberbeing operable when and only when the switch is in the normal positionto establish a circuit for energizing the nor mal indication relay andbeing operable when and only when the switch is in the reverse positionto establish a circuit for energizing the reverse indication relay, astick relay, a pick-up circuit for said stick relay which is completewhen and only when both of the indication relays are deenergized, astick circuit for said stick relay, said stick circuit being establishedon picking up of the contacts of the stick relay, a normal indication.magnet operable when cleenergized to prevent movement of the lever to orfrom the normal position, said magnet being operable when energized topermit such lever movement, a reverse indication magnet operable whendeenergized to prevent movement of thelever to or from the reverseposition, said magnet being operable when energized to permit such levermovement, a circuit through which current may be supplied to energizethe normal indication magnet provided the stick relay is energized andthe lever is in the normal indication position, another circuitindependent of the stick relay for energizing the normal indicationmagnet when the lever is in the normal position, a circuit through whichcurrent maybe supplied to energize the reverse indication magnetprovided the stick relay is energized and the lever is in the reverseindication position, and

another circuit independent of the stick relay for energizing thereverse indication magnet when the lever: is in the reverse position.

:;l'1. ;In combination, a railway track switch, a motor for moving saidswitch between a normal and areverse position, a normal and a reverseindication relay, a lever movable between a normal anda reverseposition, said lever alsorhav ing a normalindication position in whichit efiects operation of the motor to move the switch to the normalposition and having a reverse indication position in which it effectsoperation of the motor to move the switch to the reverse position, amember movable in accordance with movement of the switch, said memberbeing operable when and only when the switch is in the normal positionto establish a circuit for energizing the normal indication relay andbeing operable when and only when the switch is in the reverse positionto establish a circuit for energizing the reverse indication relay, astick relay, a pick-up circuit for said stick relay which is completewhen and only whenboth of the indication relays are deenergized, a stickcircuit for said stickrelay, said stick circuit being established; onpicking up of the contacts of the stick relay, a normal indicationmagnet operable when deenergized to prevent movement of the lever to orfrom the normal position, said magnet being operable when energized topermit such lever movement, a reverse indication magnet operable whendeenergized to prevent movement of the lever to or from-the reverseposition, said magnet beingoperable when energized to permit such levermovement, a circuit through which current may be supplied to energizethe normal indication magnet provided the stick relay is energized andthe lever is in the normal indication position, another circuitindependent of the stick relay and through 'whichcurrent may be suppliedto energize the normal indication magnet when the lever is in the normalposition provided the normal indication relay is energized and thereverse indication relay is deenergized, a circuit through which currentmay be supplied to energize the reverse indication magnet provided thestick relay is energized and the lever is in the reverse indicationposition, and another circuit independent of the stick relay and throughwhich current may be supplied to energize the reverse indication magnetwhen the lever is in the reverse position provided the reverseindication relay is energized and. the normal indication relay isdeenergized.

12. In combination, a railway track switch, a motor for moving saidswitch between a normal and'a reverse position, a lever movable betweena normal and a reverse position, said lever also having a normalindication position in which it effects operation of the motor to movethe switch to the normal position and having a reverse indicationposition in which it effects operation of being operable in either itsnormal or its reverse position to interruptsaidstick circuit, a circuit1 for supplying current to energize the normal indication magnet, saidcircuitbeing complete only when the lever is-in the normal indicationposition and the stickrelay isenergized, means responsive to theposition ofthe switch for also controlling said last-named circuit, saidmeans being operable to-establish said circuit only when the switch isin the-normal position, a circuit for supplying current to energize thereverse indication magnet, said circuit being complete only when thelever is in the reverse indication position and the stick relay isenergized, and means responsive to the position of the switch for alsocontrolling said last-named circuit, said means being operable toestablish said circuit only when the switch isin the reverse position.

13. In combination, a railway'track switch, a motor for moving saidswitch between a normal and a reverse position, a control lever movablebetween a normal and a reverse position, said control lever also havinga normal indication position in which it effects operation of the motorto move the switch to the normal position and a reverse indicationposition in which it effects operation of the motor to move the switchtothe reverse position, a normal indication magnet operable whendeenergized to prevent movement'of the control lever from the normalindication position to the normal position, said magnet being operablewhen energized to' permit such lever movement, a reverse indicationmagnet operable when deenergized to prevent movement of-the controllever from the reverse indication position to the reverse position,saidmagnet being operable when energized to permit such lever movement,a normal supply circuit for energizing the normal indication magnet anda reverse supply circuit for energizing the reverse indication magnet, astick relay having contacts controlling said normal and reverse supplycircuits, said stick relay contacts also controlling a stick circuit forenergizing its own winding, said stick re' lay contacts being operableto permit said circuits to be completed whenand onlywhen the relaywinding is energized, means operable when and only when the switch is intransit between its two positions to establish a pick-up circuit for thestick relay, contacts controlled by said lever for controlling saidsupply circuits and said stick circuit, said contacts being operable tointerrupt said circuits when the lever is in either its normal or'itsreverse position and being operable to permit said stick circuit to becompleted when the lever is in either of its indication positions, saidcontacts being also operable when and only when the lever is in thenormal indication position to permit the normal supply circuit to becompleted and being operablewhen and only when the lever is in thereverse indication position to permit the reverse supply circuit to becompleted, and means governed by the switch for also controlling saidsupply circuits, said means being operable to permit completion of, thenormal supply circuit when and only when the switch is in the normalposition and being operable to permit completion of the reverse supplycircuit when and only when the switch is in the reverse position.

'14. In combination, a railway track switch, a

and a reverse position, a control lever movable between anormal and areverse position, said control lever also having a normal indicationposition in which it effects operation of the 'motor to move theswitch'to thenormal position and a reverse indication position in whichit effects operation of the motor to move the switch to the reverseposition, a normal indication magnet operable when deenergized toprevent movement of the control lever from the normal indicationposition to the normal position, said magnet being operable whenenergized to permit such lever movement, a reverse indication magnetoperable when deenergized to prevent movement of the control lever fromthe reverse indication position to the reverse position, said magnetbeing operable when energized to permit such lever movement, a normalsupply circuit for energizing the normal indication magnet and a reversesupply circuit for energizing the reverse indication magnet, a stickrelay having contacts controlling said normal and reverse supplycircuits, said stick relay contacts also controlling a stick circuit forenergizing its own winding, said stick relay contacts being operable topermit said circuits to be completed when and only when the relaywinding is energized, means operable when and only when the switch is intransit between its two positions to establish a pick-up circuit for thestick relay, contacts controlled by said lever for controlling saidsupply circuits and said stick circuit, said contacts being operable tointerrupt said circuits when the lever is in either its normal or itsreverse position and being operable to permit said stick circuit to becompleted when the lever is in either of its indicationpositions, saidcontacts being also operable when and only when the lever is in thenormal indication position to permit the normal supply circuit to becompleted and being operable when and only when the lever is in thereverse indication position to permit the reverse supply circuit to becompleted, a normal and a reverse indication relay, means governed bythe switch for energizing said indication relays, said means beingoperable when and only when the switch is in the normal position toenergize the normal indication relay and being operable when and onlywhen the switch is in the reverse position to energize the reverseindication relay, the indication relays controlling said supply circuitsin such manner that the normal supply circuit is complete only when thenormal indication relay is energized and the reverse indication relay isdeenergized, and so that the reverse supply circuit is complete onlywhen the reverse indication relay is energized and the normal indicationrelay is deenergized.

15. In an interlocking machine, in combination, a railway track switch,a motor for moving said switch between a normal and a reverse position,a control lever movable between a normal and a reverse position, saidcontrol lever also having a normal indication position in which itefiects operation of the motor to move the switch to the normal positionand a reverse indication position in which it efiects operation of themotor to move the switch to the reverse position, a normal indicationmagnet operable when deenergized to prevent movement of the controllever from the normal indication position to the normal 7 position, saidmagnet being operable when energized to permit suchlever movement, areverse indication magnet operable when deenergized to prevent movementof the control lever from the reverse indication position to the reverseposition, said magnet being operable when energized to permit such levermovement, a normal supply circuit for energizing the normal indicationmagnet and a reverse supply circuit for energizing the reverseindication magnet, means operable when and only when the switch is intransit between its two positions and the control lever is in either ofits indication positions to establish connections to permit the supplycircuits to be completed and to maintain such connections until thecontrol lever is moved to either its normal or reverse position,contacts associated with the control lever and controlling said supplycircuits, said contacts being operable when and only when the lever isin the normal indication position to permit the normal supply circuit tobe completed and being operable when and only when the lever is in thereverse indication position to permit the reverse supply circuit to becompleted, and means governed by the switch for also controlling saidsupply circuits, said means being operable to permit completion of thenormal supply circuit only when the switch is in the normal position andbeing operable to permit completion of the reverse supply circuit onlywhen the switch is in the reverse position.

16. In an interlocking machine, in combination, a railway track switch,a motor for moving said switch between a normal and a reverse position,a control lever movable between a normal and a reverse position, saidcontrol lever also having a normal indication position in which iteffects operation of the motor to move the switch to the normal positionand a reverse indication position in which it effects operation of themotor to move the switch to the reverse position, a normal indicationmagnet operable when deenergized to prevent movement of the controllever from the normal indication position to thenormal position, saidmagnet being operable when energized to permit such lever movement, areverse indication magnet operable when deenergized to prevent movementof the control lever from the reverse indication position to the reverseposition, said magnet being operable when energized to permit such levermovement, a normal supply circuit for energizing the normal indicationmagnet and a reverse supply circuit for energizing the reverseindication magnet, means operable when and only when the switch is intransit between its two positions and the control lever is in either ofits indication positions to establish connections to permit the supplycircuits to be cmpleted and to maintain such connections until thecontrol lever is moved to either its normal or reverse position,contacts associated with the control lever and controlling said supplycircuits, said contacts being operable when and only when the lever isin the normal indication position to permit the normal supply circuit tobe completed and being operable when and only when the lever is in thereverse indication position to permit the reverse supply circuit to becompleted, a normal and a reverse indication relay, means governed bythe switch for energizing said indication relays, said means beingoperable when and only when the switch is in the normal position toenergize the normal indication relay and being operable when and onlywhen the switch is in the reverse position to energize the reverseindication relay, the indication relays controlling said supply circuitsin such manner that the normal supply circuit is complete only when thenormal indication relay is energized and the reverse indication relay isdeenergized, and. so that the reverse supply circuit is complete onlywhen the reverse indication relay is energized and the normal indicationrelay is deenergized.

HENRY S. YOUNG.

